LXR linux/arch/riscv/include/asm/cpu

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (c) 2020 Western Digital Corporation or its affiliates.
   4 * Based on arch/arm64/include/asm/cpu_ops.h
   5 */
   6#ifndef __ASM_CPU_OPS_H
   7#define __ASM_CPU_OPS_H
   8
   9#include <linux/init.h>
  10#include <linux/sched.h>
  11#include <linux/threads.h>
  12
  13/**
  14 * struct cpu_operations - Callback operations for hotplugging CPUs.
  15 *
  16 * @name:               Name of the boot protocol.
  17 * @cpu_prepare:        Early one-time preparation step for a cpu. If there
  18 *                      is a mechanism for doing so, tests whether it is
  19 *                      possible to boot the given HART.
  20 * @cpu_start:          Boots a cpu into the kernel.
  21 * @cpu_disable:        Prepares a cpu to die. May fail for some
  22 *                      mechanism-specific reason, which will cause the hot
  23 *                      unplug to be aborted. Called from the cpu to be killed.
  24 * @cpu_stop:           Makes a cpu leave the kernel. Must not fail. Called from
  25 *                      the cpu being stopped.
  26 * @cpu_is_stopped:     Ensures a cpu has left the kernel. Called from another
  27 *                      cpu.
  28 */
  29struct cpu_operations {
  30        const char      *name;
  31        int             (*cpu_prepare)(unsigned int cpu);
  32        int             (*cpu_start)(unsigned int cpu,
  33                                     struct task_struct *tidle);
  34#ifdef CONFIG_HOTPLUG_CPU
  35        int             (*cpu_disable)(unsigned int cpu);
  36        void            (*cpu_stop)(void);
  37        int             (*cpu_is_stopped)(unsigned int cpu);
  38#endif
  39};
  40
  41extern const struct cpu_operations *cpu_ops[NR_CPUS];
  42void __init cpu_set_ops(int cpu);
  43void cpu_update_secondary_bootdata(unsigned int cpuid,
  44                                   struct task_struct *tidle);
  45
  46#endif /* ifndef __ASM_CPU_OPS_H */
  47